rust16 installs a limited set of rust binaries to /opt/rust16. This is
to allow rust-based SlackBuilds to build more recent versions than
would be possible with system rust.

To use the rust16 binaries in a SlackBuild, make the following export
statements:

  export PATH="/opt/rust16/bin:$PATH"
  export LD_LIBRARY_PATH="/opt/rust16/lib$LIBDIRSUFFIX:$LD_LIBRARY_PATH"

rust16 is not intended as a substitute for rustup or for the Slackware
rust package in terms of rust development purposes.

Separate downloads are available for i686 and x86_64. -current users can
safely ignore rust16 as a dependency.
